Using Windows Environment Variable in Native Code

// I have a permission to create a file to Program Files
const std::wstring sFileName = L"%ProgramFiles%\\aaa.txt";
HANDLE h 开发者_高级运维= CreateFileW(
  sFileName.c_str(),
  GENERIC_READ,
  FILE_SHARE_DELETE,
  0,
  CREATE_ALWAYS,
  0,
  0);
// INVALID_HANDLE_VALUE with ERROR_PATH_NOT_FOUND

I expected it makes C:\Program Files\aaa.txt or C:\Program Files (x86)\aaa.txt depend on the Os' environment. But it didn't work.

What's wrong? How do I use environment variable in native code?

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You need to explicitly expand the environment variables. One way is using the Win32 API's ExpandEnvironmentStrings or ExpandEnvironmentStringsForUser

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try using the GetEnvironmentVariable function